Givewp: feat: add opt-in for telemetry (anonymous tracking)

[mathetos]

We want to understand our Give users better, so let's give them the ability to offer that data to us. Here's a simple mock-up:

Considerations

1. Do we want to separate the ability to gather data from the MailChimp opt-in? Maybe not all people want both, they don't want emails, but are fine with us collecting data
2. If they opt-in, is the data technically "anonymous". We need to spell out exactly what we're collecting on a page on our site and determine whether that actually is "anonymous" data or not.

[DevinWalker]

Data Points for Give Dashboard

• Number of Donations
• WordPress Version
• Theme Name
• Theme Version
• Currency
• Number of Donors
• Days Give Usage
• Number of Premium Add-ons
• Are Give Licenses Active

Please add to the list above with data points you'd like to see in the future Give dashboard.

[kevinwhoffman]

Need to figure out GDPR implications in #2458. Iceboxing this for now.

[kevinwhoffman]

Closing due to inactivity and the fact that the Setup Page is being overhauled in GiveWP 2.8.0.

Telemetry definitely warrants further discussion, but in the form of a pitch.